s4:misc: remove last usage of legacy event_ fn names
[idra/samba.git] / source4 / nbt_server / wins / winsclient.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    wins client name registration and refresh
5
6    Copyright (C) Andrew Tridgell        2005
7    
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12    
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17    
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "nbt_server/nbt_server.h"
24 #include "nbt_server/wins/winsserver.h"
25 #include "libcli/composite/composite.h"
26 #include "lib/events/events.h"
27 #include "librpc/gen_ndr/ndr_nbt.h"
28 #include "smbd/service_task.h"
29 #include "param/param.h"
30
31 /* we send WINS client requests using our primary network interface 
32 */
33 static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
34 {
35         struct nbtd_server *nbtsrv = iface->nbtsrv;
36         return nbtsrv->interfaces->nbtsock;
37 }
38
39
40 static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
41                               struct timeval t, void *private_data);
42
43 /*
44   retry a WINS name registration
45 */
46 static void nbtd_wins_register_retry(struct tevent_context *ev, struct tevent_timer *te,
47                                      struct timeval t, void *private_data)
48 {
49         struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
50         nbtd_winsclient_register(iname);
51 }
52
53 /*
54   start a timer to refresh this name
55 */
56 static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
57 {
58         uint32_t refresh_time;
59         uint32_t max_refresh_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200);
60
61         refresh_time = MIN(max_refresh_time, iname->ttl/2);
62         
63         tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
64                         iname, 
65                         timeval_add(&iname->registration_time, refresh_time, 0),
66                         nbtd_wins_refresh, iname);
67 }
68
69 struct nbtd_wins_refresh_state {
70         struct nbtd_iface_name *iname;
71         struct nbt_name_refresh_wins io;
72 };
73
74 /*
75   called when a wins name refresh has completed
76 */
77 static void nbtd_wins_refresh_handler(struct tevent_req *subreq)
78 {
79         NTSTATUS status;
80         struct nbtd_wins_refresh_state *state =
81                 tevent_req_callback_data(subreq,
82                 struct nbtd_wins_refresh_state);
83         struct nbtd_iface_name *iname = state->iname;
84
85         status = nbt_name_refresh_wins_recv(subreq, state, &state->io);
86         TALLOC_FREE(subreq);
87         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
88                 /* our WINS server is dead - start registration over
89                    from scratch */
90                 DEBUG(2,("Failed to refresh %s with WINS server %s\n",
91                          nbt_name_string(state, &iname->name), iname->wins_server));
92                 talloc_free(state);
93                 nbtd_winsclient_register(iname);
94                 return;
95         }
96
97         if (!NT_STATUS_IS_OK(status)) {
98                 DEBUG(1,("Name refresh failure with WINS for %s - %s\n", 
99                          nbt_name_string(state, &iname->name), nt_errstr(status)));
100                 talloc_free(state);
101                 return;
102         }
103
104         if (state->io.out.rcode != 0) {
105                 DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n", 
106                          state->io.out.wins_server,
107                          nbt_name_string(state, &iname->name),
108                          nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
109                 iname->nb_flags |= NBT_NM_CONFLICT;
110                 talloc_free(state);
111                 return;
112         }       
113
114         DEBUG(4,("Refreshed name %s with WINS server %s\n",
115                  nbt_name_string(state, &iname->name), iname->wins_server));
116         /* success - start a periodic name refresh */
117         iname->nb_flags |= NBT_NM_ACTIVE;
118         if (iname->wins_server) {
119                 /*
120                  * talloc_free() would generate a warning,
121                  * so steal it into the tmp context
122                  */
123                 talloc_steal(state, iname->wins_server);
124         }
125         iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
126         iname->registration_time = timeval_current();
127
128         talloc_free(state);
129
130         nbtd_wins_start_refresh_timer(iname);
131 }
132
133
134 /*
135   refresh a WINS name registration
136 */
137 static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
138                               struct timeval t, void *private_data)
139 {
140         struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
141         struct nbtd_interface *iface = iname->iface;
142         struct nbt_name_socket *nbtsock = wins_socket(iface);
143         struct tevent_req *subreq;
144         struct nbtd_wins_refresh_state *state;
145
146         state = talloc_zero(iname, struct nbtd_wins_refresh_state);
147         if (state == NULL) {
148                 return;
149         }
150
151         state->iname = iname;
152
153         /* setup a wins name refresh request */
154         state->io.in.name            = iname->name;
155         state->io.in.wins_servers    = (const char **)str_list_make_single(state, iname->wins_server);
156         state->io.in.wins_port       = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
157         state->io.in.addresses       = nbtd_address_list(iface, state);
158         state->io.in.nb_flags        = iname->nb_flags;
159         state->io.in.ttl             = iname->ttl;
160
161         if (!state->io.in.addresses) {
162                 talloc_free(state);
163                 return;
164         }
165
166         subreq = nbt_name_refresh_wins_send(state, ev, nbtsock, &state->io);
167         if (subreq == NULL) {
168                 talloc_free(state);
169                 return;
170         }
171
172         tevent_req_set_callback(subreq, nbtd_wins_refresh_handler, state);
173 }
174
175 struct nbtd_wins_register_state {
176         struct nbtd_iface_name *iname;
177         struct nbt_name_register_wins io;
178 };
179
180 /*
181   called when a wins name register has completed
182 */
183 static void nbtd_wins_register_handler(struct tevent_req *subreq)
184 {
185         NTSTATUS status;
186         struct nbtd_wins_register_state *state =
187                 tevent_req_callback_data(subreq,
188                 struct nbtd_wins_register_state);
189         struct nbtd_iface_name *iname = state->iname;
190
191         status = nbt_name_register_wins_recv(subreq, state, &state->io);
192         TALLOC_FREE(subreq);
193         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
194                 /* none of the WINS servers responded - try again 
195                    periodically */
196                 int wins_retry_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300);
197                 tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
198                                 iname,
199                                 timeval_current_ofs(wins_retry_time, 0),
200                                 nbtd_wins_register_retry,
201                                 iname);
202                 talloc_free(state);
203                 return;
204         }
205
206         if (!NT_STATUS_IS_OK(status)) {
207                 DEBUG(1,("Name register failure with WINS for %s - %s\n", 
208                          nbt_name_string(state, &iname->name), nt_errstr(status)));
209                 talloc_free(state);
210                 return;
211         }       
212
213         if (state->io.out.rcode != 0) {
214                 DEBUG(1,("WINS server %s rejected name register of %s - %s\n", 
215                          state->io.out.wins_server,
216                          nbt_name_string(state, &iname->name),
217                          nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
218                 iname->nb_flags |= NBT_NM_CONFLICT;
219                 talloc_free(state);
220                 return;
221         }       
222
223         /* success - start a periodic name refresh */
224         iname->nb_flags |= NBT_NM_ACTIVE;
225         if (iname->wins_server) {
226                 /*
227                  * talloc_free() would generate a warning,
228                  * so steal it into the tmp context
229                  */
230                 talloc_steal(state, iname->wins_server);
231         }
232         iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
233
234         iname->registration_time = timeval_current();
235
236         DEBUG(3,("Registered %s with WINS server %s\n",
237                  nbt_name_string(state, &iname->name), iname->wins_server));
238
239         talloc_free(state);
240
241         nbtd_wins_start_refresh_timer(iname);
242 }
243
244 /*
245   register a name with our WINS servers
246 */
247 void nbtd_winsclient_register(struct nbtd_iface_name *iname)
248 {
249         struct nbtd_interface *iface = iname->iface;
250         struct nbt_name_socket *nbtsock = wins_socket(iface);
251         struct nbtd_wins_register_state *state;
252         struct tevent_req *subreq;
253
254         state = talloc_zero(iname, struct nbtd_wins_register_state);
255         if (state == NULL) {
256                 return;
257         }
258
259         state->iname = iname;
260
261         /* setup a wins name register request */
262         state->io.in.name         = iname->name;
263         state->io.in.wins_port    = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
264         state->io.in.wins_servers = lpcfg_wins_server_list(iface->nbtsrv->task->lp_ctx);
265         state->io.in.addresses    = nbtd_address_list(iface, state);
266         state->io.in.nb_flags     = iname->nb_flags;
267         state->io.in.ttl          = iname->ttl;
268
269         if (state->io.in.addresses == NULL) {
270                 talloc_free(state);
271                 return;
272         }
273
274         subreq = nbt_name_register_wins_send(state, iface->nbtsrv->task->event_ctx,
275                                              nbtsock, &state->io);
276         if (subreq == NULL) {
277                 talloc_free(state);
278                 return;
279         }
280
281         tevent_req_set_callback(subreq, nbtd_wins_register_handler, state);
282 }